Derivative Financial Instruments (Location And Fair Values Of Derivative Financial Instruments In Our Consolidated Statement Of Financial Position) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative assets fair value	$ 13	$ 43
Derivative liabilities fair value	41	10
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	1	3
Derivative liabilities fair value	3	1
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	1	3
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Accrued Expenses And Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities fair value	3	1
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Derivative assets fair value	12	40
Derivative liabilities fair value	38	9
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	8	32
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract | Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	4	8
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract | Accrued Expenses And Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities fair value	21	7
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities fair value	$ 17	$ 2